Photo: Public domain · Public domainFort Supply reaches 100° on about 18 days a year, more than 94% of U.S. towns
The coldest hours of a January night bottom out at 22° on average. It is a dry place: less rain and snow fall here than on 87% of U.S. towns. Warming shows here too: 0.6° more than in 1901–2000, led by March. The heating season runs November to March: each of those months averages under 50°.
A year in Fort Supply at a glance
Each month’s typical high and low, and what it brings.
What stands out about Fort Supply’s climate
Compared with towns across the U.S., with Fort Supply’s place in Oklahoma beside it.
What a year in Fort Supply feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 179 frost-free days a year
In half of years the last 32° night comes by April 21 and the first by October 19. Frost and day counts come from NOAA’s station at Ft Supply 3se, OK, 2.9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Fort Supply’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 0°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 12 inches of snow a winter
Snow, measured at Ft Supply 3se, OK, falls mostly in March and December. Precipitation (rain plus melted snow) adds up to 25 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 69 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Fort Supply
74% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Ft Supply 3se, OK.
Living with Fort Supply’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
179 frost-free days in zone 7a. The last frost comes by Apr 21 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 19.
Months with highs of 62–84° and lows of 40° or more: April, May and October.
Parks & trails →Of the yearly building losses FEMA expects in Fort Supply from natural hazards, river flooding is the largest share (31%); heat waves, cold waves, winter storms and ice storms together are 24%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Fort Supply and similar climates
TownRatings has no climate map of the towns around Fort Supply yet.
Climates most like Fort Supply’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Fort Supply, OK | 22° | 95° | 25" | 12" |
| Hays, KS | 18° | 93° | 25" | 16" |
| Canyon, TX | 23° | 93° | 19" | 7.6" |
| Tucumcari, NM | 24° | 95° | 16" | 15" |
| Ogden, UT | 20° | 92° | 20" | 23" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Fort Supply averaged 0.6° warmer than the 1900s. The biggest change is in March (+2.3°).
A smaller shift than in 95% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Fort Supply compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Fort Supply’s place among Oklahoma’s.
Fort Supply weather by month
Highs, lows and precipitation from NOAA’s grid at Fort Supply’s center; snow, wet days and snow on the ground from Ft Supply 3se, OK. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 49° | 22° | 0.8" | 2.7" | 4 | 29° – 44° |
| February | 53° | 25° | 0.8" | 1.9" | 4 | 32° – 47° |
| March | 62° | 35° | 1.7" | 3.5" | 6 | 41° – 58° |
| April | 71° | 43° | 2.3" | 0.1" | 7 | 51° – 63° |
| May | 80° | 54° | 3.2" | 0.0" | 8 | 60° – 76° |
| June | 89° | 64° | 3.8" | 0.0" | 7 | 71° – 83° |
| July | 95° | 68° | 2.5" | 0.0" | 6 | 77° – 88° |
| August | 93° | 67° | 3.0" | 0.0" | 7 | 74° – 85° |
| September | 85° | 58° | 1.8" | 0.0" | 5 | 67° – 79° |
| October | 73° | 45° | 2.5" | 0.1" | 6 | 52° – 65° |
| November | 60° | 33° | 1.0" | 0.4" | 4 | 39° – 53° |
| December | 49° | 24° | 1.1" | 3.7" | 4 | 28° – 40° |
| Year | 71° | 45° | 24.5" | 12.4" | 69 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 41° to 58°. July is the most reliable, staying within 11°.
Where Fort Supply’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Fort Supply’s center.
- Snow: Ft Supply 3se, OK.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Ft Supply 3se, OK, 2.9 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Fort Supply’s climate
What is the weather like in Fort Supply?
A typical July afternoon reaches 95°, a January night drops to 22°, and about 12 inches of snow falls in a normal winter. Milder January nights than 51% of U.S. towns; hotter July afternoons than 94% of U.S. towns.
How cold does it get in Fort Supply in winter?
January nights average 22°. About 124 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 29°.
How much snow does Fort Supply get?
About 12 inches in a normal winter at Ft Supply 3se, OK, most of it in March and December.
How hot does it get in Fort Supply?
July, with a typical high of 95° and a low of 68°. About 77 days a year reach 90° and 18 reach 100° (Ft Supply 3se, OK).
When is the first and last frost in Fort Supply?
In half of years the last spring frost (32°) comes by April 21 and the first fall frost by October 19, about 179 frost-free days, at Ft Supply 3se, OK.
What growing zone is Fort Supply in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 0°.
What is the best time of year to visit Fort Supply?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Fort Supply getting warmer?
Yes: 1991–2020 averaged 0.6° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 95% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Fort Supply.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.